Re: problem with back-buffered widget

> In order to learn the fox toolkit I decided to write a sudoku game.
> It's not complete yet, but so far does what's expected of it except
> for some confusing problems.
>
>
> When first started up it outputs to the console the following errors:
>
>
> X Error: code 9 major 152 minor 4: BadDrawable (invalid Pixmap or
> Window parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 23: RenderBadPicture (invalid
> Picture parameter).
> X Error: code 170 major 152 minor 7: RenderBadPicture (invalid Picture
> parameter).
>
>
>
> I suspect these have something to do with the font resizing on the
> server, but I'm not sure what to do about it.  When the app is
> resized, these errors are repeated and the canvas widget goes blank
> except for the background and the lines drawn to make the board.
> Doing things like passing another window over it will restore those
> parts which shouldn't be blank and doing anything which causes a
> canvas update restores the whole thing.
>
>
> Also, the flush left "renderAll= true;" in the method layoutBuffer was
> necessary in order to have the canvas update restore everything.  I
> would much prefer to have only the dirty bits repainted as oulined in
> the FAQ about back-buffered widgets.
>
>
> I have learned much from the docs, FAQs and mailing list archives, but
> obviously am missing some basic understanding of the repainting
> process.  Whenever I try to include a layout() method as suggested in
> the FAQ, things go really bad with the canvas always remaining grey
> and even the menus not getting painted.
>
>
> The full source is attached, but here are the bits which I would
> expect to be relevant.  I am using fox 1.6.35 and gcc 4.4.0  Any help
> would be appreciated.
>
>
> Mike
>
>
> ---
>
>
>
>   FXMAPFUNC(SEL_PAINT,           sudokuWindow::ID_CANVAS,
> sudokuWindow::onPaint),
>
>
>
> ---
>
>
> long sudokuWindow::onPaint(FXObject *, FXSelector, void *ptr)
> {
>    FXEvent *ev = (FXEvent *)ptr;
>    layoutBuffer();
>    FXDCWindow dc(canvas,ev);
>    dc.drawImage(dbuf,0,0);
>    return 1;
> }
>
>
>
> ---
>
>
> void sudokuWindow::layoutBuffer()
> {
>    FXDCWindow dc(dbuf);
>    // builds the game board from the ground up
>    int w= canvas->getWidth();
>    int h= canvas->getHeight();
>    int h9= h/9;   int w9= w/9;
>    if (lastw != w || lasth != h || font==NULL)
>    {
>       renderAll= true;      // resizing means repaint all
>       dbuf->resize(w,h);
>       lastw= w;   lasth= h;
>       // simple guess for proper font size that works well
>       int fs=h9/2;
>       if (fs != fontSize)
>       {
>          fontSize= fs;
>          if (font!=NULL)
>          {
>             font->destroy();
>             delete font;
>          }
>          font= new FXFont(getApp(),"times",fs);
>          font->create();
>       }
>       // now for the hint font
>       fs=h9/5;
>       if (fs != hfontSize)
>       {
>          hfontSize= fs;
>          if (hfont!=NULL)   delete hfont;
>          hfont= new FXFont(getApp(),"times",fs);
>          hfont->create();
>       }
>    }
> renderAll=true;
>    if (renderAll)
>    {
>       dc.setForeground(bgColor);
>       dc.fillRectangle(0,0,w,h);
>    }
>    for (int i=0; i<81; ++i)
>    {
>       if (renderAll || dirty[i] || board[i].error)
>       {
>          int x= i%9;  int y=i/9;
>          int w9= dbuf->getWidth()/9;
>          int h9= dbuf->getHeight()/9;
>          // correct for extra space in last row/column
>          int w= x==8? dbuf->getWidth()-8*w9  : w9;
>          int h= y==8? dbuf->getHeight()-8*h9 : h9;
>
>          // refresh background
>          if (i==cursor)    dc.setForeground(curColor);
>          else              dc.setForeground(bgColor);
>          dc.fillRectangle(x*w9,y*h9,w,h);
>          int v= board[i].val;
>          if (v>0)    // square has been solved show number
>          {
>             dc.setFont(font);
>             string text;   text.append(1,'0'+v);
>             int xpos= w9*x+w/2-font->getCharWidth('0'+v)/2;
>             int ypos= h9*y+h/2+h9/4;
>             if (board[i].error)     dc.setForeground(errorColor);
>             else                    dc.setForeground(fgColor);
>             dc.drawText(xpos,ypos,text.c_str() );
>          }
>          else        // square not solved show hints
>          if (allhints || (curshints && i==cursor) )
>          {
>             dc.setFont(hfont);
>             dc.setForeground(hintColor);
>             set<int>::const_iterator it;
>             for (it=board[i].possible.begin(); it!
> =board[i].possible.end(); ++it)
>             {
>                int v= *it;
>                string text;   text.append(1,'0'+v);
>                int fw= hfont->getCharWidth('0'+v)/2;
>                int xpos= (x*w9)+2*w/10+((v-1)%3)*3*w/10-fw;
>                int ypos= (y*h9)+3*h/10+((v-1)/3)*3*h/10;
>                dc.drawText(xpos,ypos,text.c_str() );
>             }
>          }
>       }
>       if (board[i].error)  dirty[i]= true;
>       else                 dirty[i]= false;
>    }
>    if (renderAll)
>    {
>       dc.setForeground(fgColor);
>       for (int i=1; i<9; ++i)
>       {
>          if ( i%3==0 )  dc.setLineWidth(3);
>          else           dc.setLineWidth(1);
>          dc.drawLine(i*w9,0,i*w9,h);
>          dc.drawLine(0,i*h9,w,i*h9);
>       }
>    }
>    renderAll= false;
> }
>
>
>
>
>
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